Effect of energy recovery on efficiency in electro-hydrostatic closed system for differential actuator

Thales Agostini*, Victor De Negri, Tatiana Minav, Matti Pietola

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)
86 Downloads (Pure)


This paper investigates energy efficiency and dynamic behavior through simulation and experiments of a compact electro-hydrostatic actuator system (EHA) consisting of an electric motor, external gear pump/motors, hydraulic accumulator, and differential cylinder. Tests were performed in a stand-alone crane in order to validate the mathematical model. The influence and importance of a good balance between pump/motors displacement and cylinder areas ratios is discussed. The overall efficiency for the performed motion is also compared considering the capability or not of energy recovery. The results obtained demonstrate the significant gain of efficiency when working in the optimal condition and it is compared to the conventional hydraulic system using proportional valves. The proposed system presents the advantages and disadvantages when utilizing components off-the-shelf taking into account the applicability in mobile and industrial stationary machines.

Original languageEnglish
Article number12
Number of pages16
Issue number1
Publication statusPublished - 25 Feb 2020
MoE publication typeA1 Journal article-refereed


  • Differential cylinder
  • Efficiency
  • Electro-hydrostatic actuator (EHA)
  • Simulation


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  • EZE: Easy zonal hydraulics

    Pietola, M., Hermansson, R., Lehto, J., Närvänen, V., Heikkinen, J., Calonius, O. & Korhonen, A.


    Project: Business Finland: Other research funding

  • IZIF: Implementation of zonal integrated future fluid power systems

    Hänninen, H., Minav, T., Heikkinen, J., DanaeeBarforooshi, S. & Kauranne, H.


    Project: Academy of Finland: Other research funding

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